Installation Procedure

NOTE: Refer to Exhaust System Inspection Notice .

Fig 1: View Of Rear Exhaust Hanger To Hanger Bracket Nuts

Courtesy of GENERAL MOTORS CORP.

NOTE: Refer to Fastener Notice .

Install the rear exhaust hanger to hanger bracket nuts.
Tighten: Tighten the nuts to 30 N.m (22 lb ft).

Fig 2: View Of Catalytic Converter, Gasket & Studs

Courtesy of GENERAL MOTORS CORP.

Install a NEW catalytic converter gasket onto the studs.
Install the catalytic converter to the rear exhaust manifold pipe.
Install and snug the catalytic converter to the rear exhaust manifold pipe nuts.

Fig 3: View Of Rear Exhaust Hanger Bracket To Rear Compartment Side Rail Bolts

Courtesy of GENERAL MOTORS CORP.

Install the rear exhaust hanger bracket to the rear compartment side rail bolts.
Tighten: Tighten the bolts to 50 N.m (37 lb ft).

Fig 4: View Of Exhaust Hanger To Rear Suspension Support Bracket Bolt

Courtesy of GENERAL MOTORS CORP.

Install the exhaust hanger to the rear suspension support bracket bolts.
Tighten: Tighten the bolts to 30 N.m (22 lb ft).
Tighten the catalytic converter to the rear exhaust manifold pipe nuts previously installed.
Tighten: Tighten the nuts to 25 N.m (18 lb ft).

Fig 5: Identifying HO2S

Courtesy of GENERAL MOTORS CORP.

If reusing the old HO2S, coat the threads with anti-seize compound, GM P/N 12377953 or equivalent.
Install the HO2S.
Tighten: Tighten the sensor to 41 N.m (30 lb ft).

Fig 6: Identifying Oxygen Sensor Wiring Harness Heat Shield

Courtesy of GENERAL MOTORS CORP.

Connect the HO2S electrical connector.
Install the CPA retainer.
Install the oxygen sensor wiring harness heat shield. Refer to Oxygen Sensor Wiring Harness Heat Shield Replacement .